$276+ Cheap flights from Decatur, IL to San Diego (DEC - SAN)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SAN
Oct 15 — Oct 221
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Decatur to San Diego with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Decatur to San Diego
Cheapest
Best
Last-minute
One-way
Cheapest flights from Decatur to San DiegoExplore the most affordable flight options available from Decatur to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2026.
Explore the most affordable flight options available from Decatur to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2026.
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/259:12 am -
2 stops12h 56m
Tue 9/2910:30 pm -
1 stop8h 05m
Deal found 9/10![United Airlines logo]()
$430
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/28:31 am -
2 stops13h 37m
Sun 12/66:23 pm -
2 stops12h 23m
Deal found 9/14![United Airlines logo]()
$489
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/19:12 am -
2 stops12h 56m
Tue 10/610:30 pm -
1 stop8h 05m
Deal found 9/13![United Airlines logo]()
$519
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/97:18 pm -
2 stops26h 50m
Mon 10/1210:30 pm -
1 stop18h 13m
Deal found 9/13![United Airlines logo]()
$534
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/297:18 pm -
1 stop29h 23m
Sat 10/310:30 pm -
1 stop8h 05m
Deal found 9/14![United Airlines logo]()
$599
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/267:18 pm -
1 stop25h 22m
Wed 9/3010:30 pm -
1 stop8h 05m
Deal found 9/11![United Airlines logo]()
$603
Best flights from Decatur to San DiegoDiscover carefully curated flight deals from Decatur to San Diego that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2026.
Discover carefully curated flight deals from Decatur to San Diego that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2026.
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/259:12 am -
2 stops12h 56m
Tue 9/2910:30 pm -
1 stop8h 05m
Deal found 9/10![United Airlines logo]()
$430
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/19:12 am -
2 stops12h 56m
Tue 10/610:30 pm -
1 stop8h 05m
Deal found 9/13![United Airlines logo]()
$519
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/96:55 pm -
1 stop18h 21m
Tue 1/127:41 pm -
2 stops11h 05m
Deal found 9/10![United Airlines logo]()
$525
Last-minute flights from Decatur to San DiegoDiscover last-minute flight deals from Decatur to San Diego. Data last updated September 15, 2026 and is based on user searches.
Discover last-minute flight deals from Decatur to San Diego. Data last updated September 15, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/219:12 am -
2 stops11h 23m
Thu 9/2410:30 pm -
1 stop8h 05m
Deal found 9/11![United Airlines logo]()
$994
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/259:12 am -
2 stops12h 56m
Tue 9/2910:30 pm -
1 stop8h 05m
Deal found 9/10![United Airlines logo]()
$430
One-way flights from Decatur to San DiegoSearch for one-way flight options from Decatur to San Diego. Find affordable one-way fares based on user searches. Data last updated September 15, 2026.
Search for one-way flight options from Decatur to San Diego. Find affordable one-way fares based on user searches. Data last updated September 15, 2026.
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/99:12 am -
1 stop26h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![United Airlines logo]()
$276
Find flight deals from Decatur to San Diego
Discover tips and strategies to find the most affordable flight options for your journey from Decatur (DEC) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $430 (United Airlines) |
One-way from | $276 (United Airlines) |
Cheapflights Fare Finder
Customize your flight search to find flights from Decatur to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 15, 2026.
Use the filters below to find and compare flights from Decatur to San Diego that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
DecaturSan Diego
DEC Decatur Arpt - SAN San Diego
DECSAN
Decatur Arpt
Fri 10/9
9:12 am-9:32 am
1 stop26h 20m
San Diego
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$276
Quickest round-trip
DecaturSan Diego
DEC Decatur Arpt - SAN San Diego
DECSAN
Decatur Arpt
Fri 9/25
9:12 am-8:08 pm
2 stops12h 56m
San Diego
Tue 9/29
10:30 pm-8:35 am
1 stop8h 05m
$430
DecaturSan Diego
DEC Decatur Arpt - SAN San Diego
DECSAN
Decatur Arpt
Thu 10/1
9:12 am-8:08 pm
2 stops12h 56m
San Diego
Tue 10/6
10:30 pm-8:35 am
1 stop8h 05m
$519
DecaturSan Diego
DEC Decatur Arpt - SAN San Diego
DECSAN
Decatur Arpt
Sat 1/9
6:55 pm-11:16 am
1 stop18h 21m
San Diego
Tue 1/12
7:41 pm-8:46 am
2 stops11h 05m
$525
Sorted by cheapest first
- Most accurate provider: When it comes to deals on Decatur, Illinois-San Diego flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Decatur, Illinois-San Diego flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Decatur, Illinois-San Diego flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Decatur, Illinois-San Diego flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Decatur, Illinois-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Decatur to San Diego
Have a flexible travel schedule? Discover the best time to fly to San Diego from Decatur with our price prediction graph.
DEC-SAN
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Reviews of airlines servicing San Diego
Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated September 15, 2026.
Read reviews from past customers who have flown United Airlines from Decatur to San Diego. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
7.7
Entertainment
7.1
Crew
8.1
Food
6.7
Overall
7.4
Comfort
7.3
Reviews
1 / 20
4.0
OkaySimon,Jun 2024
LAS - LAX
Boarding
7.7
Entertainment
7.1
Crew
8.1
Food
6.7
Overall
7.4
Comfort
7.3
Reviews
1 / 20
4.0
OkaySimon,Jun 2024
LAS - LAX
Related info for your journey
Find useful and relevant information for your journey from Decatur to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Diego?
Book flights to San Diego if you plan to visit one of these locationsEl Cajon
National City
Chula Vista
Coronado
Poway
San Ysidro
La Mesa
Santee
Julian
Lemon Grove
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Decatur
Popular flights
San Diego flight routes
Alternative routes for Decatur to San Diego
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to San Diego by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Decatur to San Diego by cabin class
Find flights from Decatur to San Diego, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Decatur and San Diego flights
Browse other Decatur and San Diego flight options. Last updated on September 15, 2026.
Other flights from Decatur
Browse through other flights departing from Decatur. Flights are based on user searches made on Cheapflights and were last updated on September 15, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to San Diego
Explore flights to San Diego departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 15, 2026.
Top airline flying from Decatur to San Diego
Discover the top airline that operate flights from Decatur to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$324 | Average$450 | FlexibilityNo cancel fee | On-time69% |